/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

/**
 * @author Alexander Y. Kleymenov
 */

package org.apache.harmony.security.x509;

import java.util.Date;

import org.apache.harmony.security.asn1.ASN1GeneralizedTime;
import org.apache.harmony.security.asn1.ASN1Implicit;
import org.apache.harmony.security.asn1.ASN1Sequence;
import org.apache.harmony.security.asn1.ASN1Type;
import org.apache.harmony.security.asn1.BerInputStream;

/**
 * The class encapsulates the ASN.1 DER encoding/decoding work with the
 * following certificate extension (OID: 2.5.29.16) (as specified in RFC 3280 -
 * Internet X.509 Public Key Infrastructure. Certificate and Certificate
 * Revocation List (CRL) Profile. http://www.ietf.org/rfc/rfc3280.txt):
 * 
 * <pre>
 * PrivateKeyUsagePeriod ::= SEQUENCE {
 *      notBefore       [0]     GeneralizedTime OPTIONAL,
 *      notAfter        [1]     GeneralizedTime OPTIONAL 
 * }
 * </pre>
 */
public class PrivateKeyUsagePeriod {

	// the value of notBeforeDate field of the structure
	private final Date notBeforeDate;
	// the value of notAfterDate field of the structure
	private final Date notAfterDate;
	// the ASN.1 encoded form of PrivateKeyUsagePeriod
	private byte[] encoding;

	/**
	 * ASN.1 DER X.509 PrivateKeyUsagePeriod encoder/decoder class.
	 */
	public static final ASN1Sequence ASN1 = new ASN1Sequence(new ASN1Type[] {
			new ASN1Implicit(0, ASN1GeneralizedTime.getInstance()),
			new ASN1Implicit(1, ASN1GeneralizedTime.getInstance()) }) {
		{
			setOptional(0);
			setOptional(1);
		}

		@Override
		protected Object getDecodedObject(BerInputStream in) {
			final Object[] values = (Object[]) in.content;
			return new PrivateKeyUsagePeriod((Date) values[0],
					(Date) values[1], in.getEncoded());
		}

		@Override
		protected void getValues(Object object, Object[] values) {

			final PrivateKeyUsagePeriod pkup = (PrivateKeyUsagePeriod) object;

			values[0] = pkup.notBeforeDate;
			values[1] = pkup.notAfterDate;
		}
	};

	/**
	 * TODO
	 * 
	 * @param notBeforeDate
	 *            : Date
	 * @param notAfterDate
	 *            : Date
	 */
	public PrivateKeyUsagePeriod(Date notBeforeDate, Date notAfterDate) {
		this(notBeforeDate, notAfterDate, null);
	}

	//
	// TODO
	// @param notBeforeDate: Date
	// @param notAfterDate: Date
	// @param encoding: byte[]
	//
	private PrivateKeyUsagePeriod(Date notBeforeDate, Date notAfterDate,
			byte[] encoding) {
		this.notBeforeDate = notBeforeDate;
		this.notAfterDate = notAfterDate;
		this.encoding = encoding;
	}

	/**
	 * Returns ASN.1 encoded form of this X.509 PrivateKeyUsagePeriod value.
	 * 
	 * @return a byte array containing ASN.1 encode form.
	 */
	public byte[] getEncoded() {
		if (encoding == null) {
			encoding = ASN1.encode(this);
		}
		return encoding;
	}

	/**
	 * Returns the value of notAfter field of the structure.
	 * 
	 * @return notAfter
	 */
	public Date getNotAfter() {
		return notAfterDate;
	}

	/**
	 * Returns the value of notBefore field of the structure.
	 * 
	 * @return notBefore
	 */
	public Date getNotBefore() {
		return notBeforeDate;
	}
}
